Assessment of Vibration Resistance of Motor-Transmission Units of a Vehicle With Two Internal Combustion Engines

The paper analyzes research on improving the energy efficiency of cars with two independent motor-transmission systems by matching the transmission parameters and engine operating modes. When using two identical powertrains, each driving the wheels of one side of the car, there is no problem of equalizing efficiency, since both engines operate in the same mode. There is also no problem with determining the part of the mass driven to the crankshaft of one engine, since the driven mass is divided in half between both engines. The problem arises when two engines are installed on a car with their own transmissions that drive different groups of axles of the car. To achieve this goal, we determined the distribution of the mass of a gradually moving vehicle between two parallel oscillating systems and the cyclic elastic efficiency of the motor-transmission system of a car with two parallel internal combustion engines controlling different groups of axles. As a result of the study, the condition for obtaining the maximum value of the elastic-dynamic cyclic efficiency of a motor-transmission system with two engines installed in parallel was determined. This condition is met due to the equality of the elastic-dynamic efficiencies of the motor-transmission systems of the first and second engines.